I would also suggest a rice dish. If you do make risotto, try and make sure you spike with some lemon zest, as it will be fat on fat on fat (although that may be your thing). I suggest rice pilaf, its drier, less rich, and if you spike it with some lemon zest, and something like dried cranberries it will cut the fat of the lobster and butter (you are serving it with clarified butter, right?). That's my two cents.